Struct std::collections::btree_map::VacantEntry 1.0.0[−][src]
pub struct VacantEntry<'a, K, V> where
K: 'a,
V: 'a, { /* fields omitted */ }
Expand description
A view into a vacant entry in a BTreeMap
.
It is part of the Entry
enum.
Implementations
Sets the value of the entry with the VacantEntry
’s key,
and returns a mutable reference to it.
Examples
use std::collections::BTreeMap; use std::collections::btree_map::Entry; let mut map: BTreeMap<&str, u32> = BTreeMap::new(); if let Entry::Vacant(o) = map.entry("poneyland") { o.insert(37); } assert_eq!(map["poneyland"], 37);Run